2,4:(-6)

The expression you provided looks like a ratio or a division problem. In mathematical terms, 2,4:(-6) could mean:

1. A ratio \( \frac{2.4}{-6} \)
2. It could also mean a division \( 2.4 \div (-6) \)

If we take it as the second interpretation:

\[ 2.4 \div (-6) = -0.4 \]

If you meant something else or have more context to provide, please clarify!